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Process for combining amphipathy segmented copolymer electrolyte of POEM-PDMS

A technology of amphiphilic block and copolymer, which is applied in the direction of circuits, electrical components, battery components, etc., can solve the problems of lithium-ion battery safety, battery thermal runaway, battery fire and combustion, etc. Achieve the effects of convenient operation, small equipment investment and simple preparation process

Active Publication Date: 2013-10-16
菏泽天宇锂电能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the organic electrolyte still exists in the battery, it does not fundamentally solve all the safety problems of lithium-ion batteries.
Among them, the most prominent problem is that under the overcharge condition of the polymer lithium-ion battery, like the liquid lithium-ion battery, the lithium cobalt oxide positive electrode material undergoes a decomposition reaction, releasing a large amount of heat and active oxygen, causing the negative electrode material, binder, etc. A series of exothermic reactions with the electrolyte can also lead to thermal runaway of the battery, causing the battery to catch fire

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: a) 200 milliliters of polyethylene glycol methyl ether methacrylate monomer (PEGMEM, wherein the number of oxyethylene EO segments is 5), 60 milliliters of polydimethylsiloxane monomer (PDMS) by weight Ratio 80:20, dissolved in 1000 ml of ethyl acetate; b) 60 mg of initiator 2,2′-azobisisobutyronitrile was dissolved in 100 ml of ethyl acetate; c) the above two ethyl acetate solutions were mixed Evenly, transfer to an airtight flask; d) Use pure argon to evacuate the air in the ethyl acetate mixed solution for 30 minutes; e) Heat the ethyl acetate mixed solution to 60°C and keep it warm for 24 hours; f) Use The polymer product obtained in step e of petroleum ene cleaning, and vacuum drying to obtain POEM-g-PDMS amphiphilic block copolymer; g) using tetrahydrofuran as a solvent, lithium trifluoromethanesulfonate is Li : EO = 1:5 ratio Doped with POEM-g-PDMS copolymer; h) POEM-g-PDMS copolymer electrolyte membrane was obtained by coating and controlled drying by...

Embodiment 2

[0019]Example 2: a) 130 ml of polyethylene glycol methyl ether methacrylate monomer (PEGMEM, the number of ethylene oxide EO segments is 15), 60 ml of polydimethylsiloxane monomer (PDMS) according to the design Ratio (weight ratio 70:30) was dissolved in 1000 ml of ethyl acetate; b) 60 mg of initiator 2,2′-azobisisobutyronitrile was dissolved in 100 ml of ethyl acetate; c) the above two ethyl acetate Mix the ester solution evenly and transfer it to an airtight flask; d) Use pure argon to evacuate the air in the ethyl acetate mixed solution for 30 minutes; e) Heat the ethyl acetate mixed solution to 68°C and keep it warm for 24 hours; f) Wash the polymer product obtained in step e with petroleum ene, and dry it in vacuum to obtain POEM-g-PDMS amphiphilic block copolymer; g) Use tetrahydrofuran as solvent, Li trifluoromethanesulfonate Li : EO = 1 : Doping POEM-g-PDMS copolymer at a ratio of 20; h) POEM-g-PDMS copolymer electrolyte membrane was obtained by coating and controlled ...

Embodiment 3

[0021] Example 3: a) 130 ml of polyethylene glycol methyl ether methacrylate monomer PEGMEM, wherein the number of oxyethylene EO segments is 30), 60 ml of polydimethylsiloxane monomer (PDMS) by weight 70:30, dissolved in 1000 ml of ethyl acetate; b) 60 mg of initiator 2,2′-azobisisobutyronitrile was dissolved in 100 ml of ethyl acetate; c) Mix the above two ethyl acetate solutions evenly , transferred to an airtight flask; d) evacuate the air in the ethyl acetate mixed solution with high-purity argon for 30 minutes; e) heat the ethyl acetate mixed solution to 80°C and keep it warm for 24 hours; f) use The polymer product obtained in petroleum ene cleaning step e, and vacuum-dried to obtain POEM-g-PDMS amphiphilic block copolymer; g) using tetrahydrofuran as a solvent, lithium trifluoromethanesulfonate in the ratio of Li : EO = 1: 30 Doped with POEM-g-PDMS copolymer; h) POEM-g-PDMS copolymer electrolyte membrane was obtained by coating and controlled drying by tape casting met...

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PUM

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Abstract

The invention discloses a process for combining amphipathy segmented copolymer electrolyte of POEM (polyoxyethylene methyl methacrylate)- PDMS (polydimethylsiloxane). The prepared electrolyte film is used for manufacturing a novel full solid lithium ion battery. In the combining process of a copolymer, users can control the length of the hydrophilic POEM section and the component proportion of the POEM and the PDMS to simultaneously increase glass-transition temperature of the copolymer, reduce room temperature viscosity coefficient of the copolymer, increases dosage concentration of lithium ions in the POEM-g-PDMS amphipathy segmented copolymer electrolyte, and improves conductivity of the lithium ions of the copolymer electrolyte. The copolymer electrolyte is simple in combining process, less in equipment investment and suitable for industrial production.

Description

technical field [0001] The invention relates to a process for synthesizing an amphiphilic block copolymer electrolyte of POEM (polyoxyethylene methyl methacrylate)-PDMS (polydimethylsiloxane), and belongs to the technical field of new materials. Background technique [0002] Lithium-ion battery is a new generation of rechargeable battery, which has the advantages of high energy / power density, high working voltage (~3.7V), small self-discharge, no memory effect, green and pollution-free, and is by far the best overall performance battery unit. In the past two decades, lithium-ion batteries have developed rapidly, and have dominated the field of portable electronic devices such as notebook computers, mobile phones, and digital cameras, as well as power tools, due to their high performance and low price ratio. At present, lithium-ion batteries have been developed as power sources for hybrid electric vehicles (HEV) and electric vehicles (EV), and have gradually been expanded as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L57/06C08L83/04C08F299/02C08G77/38H01M2/16
CPCY02E60/12Y02E60/10
Inventor 韦伟峰胡许先
Owner 菏泽天宇锂电能源科技有限公司
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